Xingma Hearing Aid XM-919A

● Product name : Xingma Hearing Aid XM-919A ● Product Code : SEL841 ● Brand Name : Xingma ● Model Number : XM-919A ● Wearing Mode: In-ear ● Maximum loudness: 133 +/- 4 dB ● Sensitivity: 48 +/- 5 dB ● Frequency response: 300~4500 Hz ● Noise: =< 30dB ● Cable length: 110 cm ● Features: Adjustable volume ● Color: Beige ● Material: Plastic ● Quantity: 1 ● Power: 1 x LR44 battery (included) ● Packing List: 1 x Voice amplifier 1 x Earphones (110cm-cable) 1 x LR44 battery 1 x English user manual Xingma Hearing Aid XM-919A-- Compartment for installing AG13 batteries (1 battery is included). Volume control (sensitivity) with built-in switch, a convenient clasp and a hole for hanging by a cord. Open the battery compartment cover by sliding it forward to install the AG13 battery, and place the battery in the cartridge according to polarity: + and -; Turn the volume control to the right until it clicks (power on) and to the very minimum position of the volume. Install the headphone plug into the jack.